Investments and Fair Value Measurements - Available-for-Sale Short-Term Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 218,303	$ 296,185
Gross unrealized gains	202	233
Gross unrealized losses	(582)	(990)
Fair value	217,923	295,428
U.S. Government and Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	65,345	70,893
Gross unrealized gains	2	49
Gross unrealized losses	(358)	(348)
Fair value	64,989	70,594
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	138,399	198,166
Gross unrealized gains	152	102
Gross unrealized losses	(200)	(621)
Fair value	138,351	197,647
Municipal Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,047	1,278
Gross unrealized losses	(1)	(1)
Fair value	1,046	1,277
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	12,823	24,233
Gross unrealized gains	47	79
Gross unrealized losses	(21)	(17)
Fair value	12,849	24,295
Mortgage-Backed Securities - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	689	1,615
Gross unrealized gains	1	3
Gross unrealized losses	(2)	(3)
Fair value	$ 688	$ 1,615

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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